Question 132038
Number of nickels:  n
Number of dimes: d
Number of quarters: q


Value of the nickels: 5n cents
Value of the dimes: 10d cents
Value of the quarters: 25q cents


Total money: $5.45, but express it as 545 cents.


Twice as many quarters as dimes:
q = 2d or d = q/2


11 more nickels than quarters:
n = q + 11


Total value equation:
5n + 10d + 25q = 545


Substitute for n and d
5(q + 11) + 10(q/2) + 25q = 545


You should be able to take it from there.